Terrorist 'Dirty Bomb' Seizures Double

This is troubling: Terrorist 'Dirty Bomb' Seizures Double. "The Times newspaper claims to have seen figures from the International Atomic Energy Agency (IAEA) showing more than 300 seizures of the dangerous materials since 2002 - primarily in Europe." I'm not sure how to reconcile the statements: "There were 103 cases of illicit trafficking in 2005" and "Western security agencies thwarted 16 attempts to smuggle plutonium or uranium last year alone."